Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dac38cec4e5d81…

MALICIOUS

PDF

89.9 KB Created: 2021-08-15 17:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a44ab9ef42cd4f53c9d8b48bdb3ebe8b SHA-1: f8241c4e3e1e5dfb33037c2d01c4300eb74e8fd6 SHA-256: 41dac38cec4e5d81cb9d1e9573d408360b43f3ba7592e3fedf68581de116818d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to drive traffic to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=habibie+ainun+full+movie+hd PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f534d815b---bogakuzupativo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ba44133b---70548855931.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee8ca9f60---67369804730.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/purefitesuliwija.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf7d8d8b8---40711760680.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/kerifipobegir.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/gefemakej.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a954fb6415---14529370040.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/veletijaworareli.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/66967089477.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/rozimexasekepafij.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623680787.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/rozegebukirolana.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8211b430283878fd5981fff77d1f831e/mebozep.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ruwiwovu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gutetamoxezebuwu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714079f2d30---95612409707.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/buputukuxusodatosope.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/bagodenerenijogajazis.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/jorafosupimovawixurabo.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/ralewamosewaxamagezimined.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2409d71d23---tarabamedilefa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe942fe76---69337101111.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/df645cd704e26c074ee571b52b43f29a/mavojaxebujepun.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/bototikavefediropizud.pdfIn PDF document text
    • https://eternalbliss.net/file/71962080370.pdfIn PDF document text
    • https://trexanh.net/upload/files/75201267907.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_02_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 17964 bytes
SHA-256: 1f461b5ce2ca4a176da36c789036a4ae1c3e4ecc5f42bdddb7a48d950d407554
font_03_sfnt_off00013ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE4 10552 bytes
SHA-256: 011dbe9307aa94aac4ae338130183d6dacfb49a2ae84467f405069221fe2969b

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